Mezmerize DCB1 Building Thread - Page 104 - diyAudio
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Old 25th September 2013, 01:19 AM   #1031
Gooch is offline Gooch  United States
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Just finished my DCB1 the hardest part was making the chassis a lot of test fitting it was my first time making a chassis all out of medal. I used Nichicon KG electrolytic caps and PRP and Vishay resistor, and Cardas RCA's. Everything tested spot on power up and it just sounds wonderful so much more depth to the sound stage I couldn't believe it I thought the B1 sounded good but this is another level.

Thanks Salas and everyone else that had a part in bring this to life. Here is a few photos.
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Old 25th September 2013, 02:26 AM   #1032
Salas is offline Salas  Greece
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Excellent DIY. Well done and enjoy the music.
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Old 27th September 2013, 08:26 PM   #1033
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Hi guys
I am getting a low level hum on the input I am using for my phono stage any suggestions would really help.


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Old 27th September 2013, 08:43 PM   #1034
Salas is offline Salas  Greece
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Its only there when you connect a phono stage VS any line level source on that same input? Surely the phono stage does not produce that hum when connected to another preamp? Try making the DCB1 chassis grounded using a wire from its PSU 0 to chassis if that will help the general scheme of things with the phono.
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Old 27th September 2013, 08:53 PM   #1035
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Typically a ground problem. Check TT ground connection and connection to phono stage ground terminal, perhaps try an external ground connection from TT/phono to Mez ground. If you disconnect inputs to phono does it disappear?
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Old 27th September 2013, 08:53 PM   #1036
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Quote:
Originally Posted by Salas View Post
Its only there when you connect a phono stage VS any line level source on that same input? Surely the phono stage does not produce that hum when connected to another preamp? Try making the DCB1 chassis grounded using a wire from its PSU 0 to chassis if that will help the general scheme of things with the phono.
The hum follows the inputs either one the phono plugged into. Are you saying add a wired to the center tap then to the chassis


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Old 27th September 2013, 09:22 PM   #1037
Gooch is offline Gooch  United States
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Quote:
Originally Posted by BackinBlack View Post
Typically a ground problem. Check TT ground connection and connection to phono stage ground terminal, perhaps try an external ground connection from TT/phono to Mez ground. If you disconnect inputs to phono does it disappear?
Yes hum goes away when I unplug the phono
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Old 27th September 2013, 09:34 PM   #1038
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Quote:
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Yes hum goes away when I unplug the phono
So, it's more than likely the turntable ground. Either a ground loop, or no ground. Can you ground the turntable to the phono stage? Does the hum go away - no TT ground. If you lift the TT ground does the hum go away - TT and phono ground causing ground loop.
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Old 27th September 2013, 09:38 PM   #1039
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Quote:
Originally Posted by BackinBlack View Post
Typically a ground problem. Check TT ground connection and connection to phono stage ground terminal, perhaps try an external ground connection from TT/phono to Mez ground. If you disconnect inputs to phono does it disappear?
Yes hum goes away when I unplug the phono
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Old 27th September 2013, 09:41 PM   #1040
Salas is offline Salas  Greece
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Quote:
Originally Posted by Gooch View Post
Are you saying add a wired to the center tap then to the chassis
Yes
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